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Cisco Nexus 5500 Series NX-OS Layer 2 Interfaces Command Reference
OL-27880-02
Chapter S Commands
spanning-tree bpduguard
spanning-tree bpduguard
To enable bridge protocol data unit (BPDU) Guard on an interface, use the
spanning-tree bpduguard
command. To return to the default settings, use the
no
form of this command.
spanning-tree bpduguard
{
enable
|
disable
}
no spanning-tree bpduguard
Syntax Description
Command Default
The setting that is already configured when you enter the
spanning-tree port type edge bpdufilter
default
command.
Command Modes
Interface configuration mode
Command History
Usage Guidelines
BPDU Guard prevents a port from receiving BPDUs. If the port still receives a BPDU, it is put in the
error-disabled state as a protective measure.
Caution
Be careful when using this command. You should use this command only with interfaces that connect to
end stations; otherwise, an accidental topology loop could cause a data-packet loop and disrupt the
switch and network operation.
When you enable this BPDU Guard command globally, the command applies only to spanning tree edge
ports. See the
spanning-tree port type edge bpdufilter default
command for more information on the
global command for BPDU Guard. However, when you enable this feature on an interface, it applies to
that interface regardless of the spanning tree port type.
This command has three states:
•
spanning-tree bpduguard enable
—Unconditionally enables BPDU Guard on the interface.
•
spanning-tree bpduguard disable
—Unconditionally disables BPDU Guard on the interface.
•
no spanning-tree bpduguard
—Enables BPDU Guard on the interface if it is an operational
spanning tree edge port and if the
spanning-tree port type edge bpdufilter default
command is
configured.
Typically, this feature is used in a service-provider environment where the network administrator wants
to prevent an access port from participating in the spanning tree.
enable
Enables BPDU Guard on this interface.
disable
Disables BPDU Guard on this interface.
Release
Modification
5.2(1)N1(1)
This command was introduced.
